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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bdfaa042db0f756ebcbbbd34a2e02b6f0aa9f4d8eb4dab9f9e322146c34c82c' 
  AND token = 'eJgq0qvYLwiDVOH85/STmwP/F9tGSs8bs57iRV6KoHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}